methyl (1R,2R,5S,10S,11R,12R,14R,15R,23R)-12-hydroxy-1,2,8,8,15,22,22-heptamethyl-20-oxa-19-azahexacyclo[12.11.0.02,11.05,10.015,23.017,21]pentacosa-17(21),18-diene-5-carboxylate 在
sodium methylate 、
盐酸 作用下,
以
甲醇 、
甲基叔丁基醚 、
水 为溶剂,
以94%的产率得到methyl (4aS,6aR,6aR,6bR,8aR,12aR,14R,14aR,14bS)-11-cyano-10,14-dihydroxy-2,2,6a,6b,9,9,12a-heptamethyl-1,3,4,5,6,6a,7,8,8a,12,13,14,14a,14b-tetradecahydropicene-4a-carboxylate